In oxidative phosphorylation during cellular respiration, what is the primary role of ATP synthase?

• A. It uses the proton motive force to catalyze $ADP+P_i\to ATP$.
• B. It pumps protons from the intermembrane space into the mitochondrial matrix using energy from ATP hydrolysis.
• C. It transfers electrons from $NADH$ directly to $O_2$ to form water.
• D. It synthesizes $NA{D}^{+}$ by oxidizing $NADH$ in the mitochondrial matrix.

Answer: (A)